I want someone out there in RF land, who wants to accommodate trans genders, to acknowledge that it's not a good idea to put naked heterosexual non-trans boys with naked heterosexual non-trans girls in view of each other. Then I want someone to recognize that some proposals would indeed lead to this inappropriate situation and some proposals would expressly allow it. Then I want someone to explain exactly what they want to see and explain how it should be enforced to ensure the dignity of all people involved and to avoid the inappropriate situation I described above.
I'm in favour of simply letting students change in the changeroom of the gender they identify with.
I don't think your concern is legitimate for a few reasons:
- I think the "what about people who pretend to be trans?" argument tries to shift the focus of the debate onto something that would happen so infrequently it isn't worth seriously considering.
- I have just as much concern about discomfort when putting a trans boy and a cis girl, or a trans girl and a cis boy, together naked in the same room as I do with putting a cis boy and a cis girl together naked in the same room.
- The threat of violence against trans kids is a much more serious issue than the issue of potential discomfort.
Mitigate your concerns if you want, but there are really only two viable answers to the question "where should trans kids change for gym?" To answer that question, we need to look at the positives and negatives of both options, not just the negatives of one.